Sentences with phrase «observation period activities»

Not exact matches

Researchers examined pre-service teacher perceptions of their reflective practice, classroom teacher observations of the service - learning arrangement, and how the service - learning program contributed to arts activities at the elementary school over the project's five - year period.

Cloud cover data from ship observations over the North Atlantic, where measurements are denser, did not show any relationship with solar activity over the period 1953 - 1995, though a large discrepancy exists between ISCCP D2 data and surface marine observations.

A main control on atmospheric CO2 appears to be the ocean surface temperature, and remains a possibility that a significant part of the overall increase of atmospheric CO2 since at least 1958 (start of Mauna Loa observations) simply relflects the gradual warming of the oceans as a result of the prolonged period of high solar activity since 1920 (Solanki et al., 2004).

This interesting observation has the potential to identify the occurrence of extended low solar activity periods.

Some scientists question the reliability of the observations, whereas others, who accept them as reliable, suggest that the correlation may be caused by other physical phenomena with decadal periods or by a response to volcanic activity or El Niño.

Earlier models were developed based on observations corresponding to the period of high levels of solar activity, the so - called Modern Grand maximum of solar activity (Solanki et al. 2004).

My comments can be assessed by reference to the actual observations of the real world since 1961 (mentioned above) which is when the Earth embarked on one of the highest periods of solar activity in the 400 year historical record.

Taking into account the problems of the reconstruction of the TSI and SSI during the recent period of satellite observations and combining it with the fact that the solar dynamo, which is believed to drive all activity manifestations, is still not fully understood (Charbonneau 2010), one recognizes the difficulty of reconstructing the TSI and SSI into the past, when no direct measurements were available.

Direct observations of the sunspots since 1610 reveal an irregular activity cycle with an average period of about 11 years, which is modulated on longer timescales.

In assessing past trends, one must distinguish between two distinct time intervals: 1) the period of historical observations (mainly after 1850), and 2) the earlier period for which TC activity can only be reconstructed using proxy data.

Monitor students on playgrounds, in classrooms, hallways, restrooms, and cafeteria during recess and lunch periods, and in bus loading areas before and after school, to assist students in their activities, ensure proper behavior, and observation of safety rules.